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Auto-Refine mode (21st mode): - AI strategist analyzes content type and quality - Selects 3-5 optimal refinement stages from 8 available (validate, critique, expand, structure, stakeholder, clarity, edge_cases, align) - Executes stages sequentially with output chaining - Final synthesis produces polished version - Stages are content-aware — PRD gets different pipeline than essay - Saved to pipeline_runs DB Composer UX overhaul: - Initial state: full-screen centered composer overlay - Mode grid + models + prompt front-and-center for new users - On Run: composer closes, output takes full screen width - "New Prompt" button in header nav bar (not floating) - Close button (×) on composer overlay - Works across all 4 themes + mobile Dropdown fixes: - Dark theme: select options get solid #1a1d23 bg - Modern theme: select options get solid #18181b bg - Light/Reddit: select options get white bg with dark text - Native <option> elements now readable in all themes Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>